add a note about instance creators

Author: Copetan

index.html

@@ -17,6 +17,9 @@
             <a href="https://maven.ornithemc.net/api/maven/latest/file/releases/net/ornithemc/ornithe-installer-native-bootstrap/windows-x86_64?extension=exe">
                 or here for the Windows executable</a>
         </p>
+        <p>
+            (Note that the installer includes a PrismLauncher/MultiMC instance creator)
+        </p>
         &lt;~~~~~~~~~~&gt;
         <p>
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